package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 公共字段自动填充切面类
 */
@Slf4j
@Aspect
@Component
public class AutoFillAspect {


    @Before("@annotation(com.sky.anno.AutoFill)")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");
        // 1.获取目标方法的注解，并拿到注解里的属性值
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();  // 方法签名
        Method method = methodSignature.getMethod();  // 方法对象
        AutoFill autoFill = method.getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        // 2.获取目标方法的参数对象
        Object[] args = joinPoint.getArgs();
        if(args == null && args.length == 0){
            return;
        }
        Object entity = args[0];     // 拿到的是实体对象

        try {
            // 3.判断注解的属性值，如果是INSERT，就补充四个值（createTime,updateTime,createUser,UpdateUser）;
            if (operationType == OperationType.UPDATE) {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,LocalDateTime.now());
                setCreateUser.invoke(entity, BaseContext.getCurrentId());
                setUpdateTime.invoke(entity,LocalDateTime.now());
                setUpdateUser.invoke(entity,BaseContext.getCurrentId());
            }else if (operationType == OperationType.INSERT) {
                // 4.如果是UPDATE,就补充两个值（updateTime,updateUser）
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,LocalDateTime.now());
                setUpdateUser.invoke(entity,BaseContext.getCurrentId());

            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }
}
